#include <stdio.h>

typedef void test(int);

void func(int a){
    printf("%d\n", 2*a);
    return;
}

int main(){
    test* a = *func;
    printf("%p\n",func);
    printf("%p\n",*func);
    printf("%p\n",a);
    printf("%p\n",*a);
    a(2);
}